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Edit File : identifyShadowedGlobals.js \| Size : 2.85 KB
import { isBlockScopedDeclaration, isFunctionScopedDeclaration, isNonTopLevelDeclaration, } from "./parser/tokenizer"; import {TokenType as tt} from "./parser/tokenizer/types"; /** * Traverse the given tokens and modify them if necessary to indicate that some names shadow global * variables. / export default function identifyShadowedGlobals( tokens, scopes, globalNames, ) { if (!hasShadowedGlobals(tokens, globalNames)) { return; } markShadowedGlobals(tokens, scopes, globalNames); } /* * We can do a fast up-front check to see if there are any declarations to global names. If not, * then there's no point in computing scope assignments. */ // Exported for testing. export function hasShadowedGlobals(tokens, globalNames) { for (const token of tokens.tokens) { if ( token.type === tt.name && !token.isType && isNonTopLevelDeclaration(token) && globalNames.has(tokens.identifierNameForToken(token)) ) { return true; } } return false; } function markShadowedGlobals( tokens, scopes, globalNames, ) { const scopeStack = []; let scopeIndex = scopes.length - 1; // Scopes were generated at completion time, so they're sorted by end index, so we can maintain a // good stack by going backwards through them. for (let i = tokens.tokens.length - 1; ; i--) { while (scopeStack.length > 0 && scopeStack[scopeStack.length - 1].startTokenIndex === i + 1) { scopeStack.pop(); } while (scopeIndex >= 0 && scopes[scopeIndex].endTokenIndex === i + 1) { scopeStack.push(scopes[scopeIndex]); scopeIndex--; } // Process scopes after the last iteration so we can make sure we pop all of them. if (i < 0) { break; } const token = tokens.tokens[i]; const name = tokens.identifierNameForToken(token); if (scopeStack.length > 1 && !token.isType && token.type === tt.name && globalNames.has(name)) { if (isBlockScopedDeclaration(token)) { markShadowedForScope(scopeStack[scopeStack.length - 1], tokens, name); } else if (isFunctionScopedDeclaration(token)) { let stackIndex = scopeStack.length - 1; while (stackIndex > 0 && !scopeStack[stackIndex].isFunctionScope) { stackIndex--; } if (stackIndex < 0) { throw new Error("Did not find parent function scope."); } markShadowedForScope(scopeStack[stackIndex], tokens, name); } } } if (scopeStack.length > 0) { throw new Error("Expected empty scope stack after processing file."); } } function markShadowedForScope(scope, tokens, name) { for (let i = scope.startTokenIndex; i < scope.endTokenIndex; i++) { const token = tokens.tokens[i]; if ( (token.type === tt.name \|\| token.type === tt.jsxName) && tokens.identifierNameForToken(token) === name ) { token.shadowsGlobal = true; } } } Back

Edit File : identifyShadowedGlobals.js | Size : 2.85 KB

import {
  isBlockScopedDeclaration,
  isFunctionScopedDeclaration,
  isNonTopLevelDeclaration,
} from "./parser/tokenizer";

import {TokenType as tt} from "./parser/tokenizer/types";

/**
 * Traverse the given tokens and modify them if necessary to indicate that some names shadow global
 * variables.
 */
export default function identifyShadowedGlobals(
  tokens,
  scopes,
  globalNames,
) {
  if (!hasShadowedGlobals(tokens, globalNames)) {
    return;
  }
  markShadowedGlobals(tokens, scopes, globalNames);
}

/**
 * We can do a fast up-front check to see if there are any declarations to global names. If not,
 * then there's no point in computing scope assignments.
 */
// Exported for testing.
export function hasShadowedGlobals(tokens, globalNames) {
  for (const token of tokens.tokens) {
    if (
      token.type === tt.name &&
      !token.isType &&
      isNonTopLevelDeclaration(token) &&
      globalNames.has(tokens.identifierNameForToken(token))
    ) {
      return true;
    }
  }
  return false;
}

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